#63759B
Closest named color: Stormy Blue (#507B9C). oklch(56.3% 0.063 264.8), rgb(99, 117, 155).
Aa
White text reads best on this color (4.61:1).
About this color
#63759B is a medium-dark, muted blue. In OKLCH its lightness is 56%, its chroma 0.063 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.027 away. White text reads best on it, at 4.61:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | muted (0.063) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.54:1 |
| White text | 4.61:1 |
Values
| HEX | #63759B |
| RGB | rgb(99, 117, 155) |
| HSL | hsl(221, 22%, 50%) |
| OKLCH | oklch(56.3% 0.063 264.8) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #63759B | 4.61:1 | AA | Lc -77.5 | Fine for body text |
| Black text on #63759B | 4.54:1 | AA | Lc 32.0 | Non-text elements, placeholder text |
| #63759B text on white | 4.61:1 | AA | Lc 72.0 | Content text, not long reading |
| #63759B text on black | 4.54:1 | AA | Lc -29.6 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAEF
oklch(93.6% 0.007 260.7)
-
Step 200
200
#D4D9E4
oklch(88.5% 0.016 266.3)
-
Step 300
300
#B8C1D4
oklch(81% 0.029 265.4)
-
Step 400
400
#93A1BE
oklch(70.8% 0.045 264.9)
-
Step 500
500
#7889AD
oklch(63% 0.058 265)
-
Step 600
600 (this color)
#63759B
oklch(56.3% 0.063 264.8)
-
Step 700
700
#506083
oklch(49% 0.06 265.3)
-
Step 800
800
#424F6A
oklch(42.8% 0.048 264.5)
-
Step 900
900
#384156
oklch(37.6% 0.038 266.6)
-
Step 950
950
#212632
oklch(26.9% 0.024 267.1)
#63759B with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #68789D | 0.012 |
| Deuteranopia (no green cones) | #63739A | 0.006 |
| Tritanopia (no blue cones) | #527D82 | 0.057 |
| Achromatopsia (no color) | #757575 | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63759B
#63759B
oklch(56.3% 0.063 264.8)
- #867349
#867349
oklch(56.3% 0.063 86.1)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #63759B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.027
- Dull Blue #49759C ΔE 0.031
- Metallic Blue #4F738E ΔE 0.034
- Grey Blue #647D8E ΔE 0.036
- Cerulean #457B9D ΔE 0.036
- Off Blue #5684AE ΔE 0.045
- Slate Gray #708090 ΔE 0.045
- Battleship Grey #6B7C85 ΔE 0.047
Use #63759B in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.